Year: 2017

Isolators and Terminals (phase 7)

Phase 7: Isolators and Terminal Blocks In this article we discuss the options we have for isolators, converters, barriers, terminal blocks and other components (index of design phases). 7-Isolators, field terminals and prefabricated cables Converters, Isolators and Barriers They are used to convert signal ranges, to electrically isolate two circuits, to duplicate signals, to amplify …

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Power Supply (phase 6)

Phase 6: Power Supply and Circuit Breakers In this article we discuss the design of 24 VDC power supply and circuit breakers (index of design phases). 6-Power Supply and Circuit Breakers The design of the power distribution of the control panel is an important aspect that can greatly influence the availability of the plant. Not …

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HMI / SCADA (phase 5)

Phase 5: Selection of HMI In this article we discuss the selection of the HMI / SCADA (index of design phases). 5-Selection of HMI or SCADA In medium or large systems, normally the operator interface is defined in the technical specification. If it is a PLC system we will talk about a SCADA, if it …

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CPU and Architecture (phase 4)

Phase 4: CPU selection and Control System Architecture In this article we discuss how to select the CPU and describe the main options for the Control System Architecture (index of design phases). 4-CPU selection and design of Control System Architecture The selection of CPU and PLC / PAC model depends directly on several parameters. Some …

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Functional Distribution (phase 3)

Phase 3: Grouping and segmentation of I/Os and Racks (functional distribution) In this article we discuss the importance of the functional distribution of I/Os, especially in medium size and large control systems (index of design phases). 3-Grouping and segmentation of signals and racks – Functional distribution The way we distribute I/O signals, modules and racks …

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Technical Requirements (phase 1)

Technical Specification – Design Phases of the Control System This is the first article in this series where we try to describe the different design phases of a control system. In PLC-based systems the design engineer must analyze all the technical requirements and make the design that meets the specifications with the lowest possible cost. …

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PLC vs DCS

PLC vs DCS – What solution to choose? When we want to integrate several software applications, use advanced control algorithms and have future expansion plans, the PLC / SCADA solution may not be adequate. Currently the differences between both solutions have decreased, but they are still important, especially in systems with more than 500 I …

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